Dark Moon Tomb? Possible spoilers

So I killed Gwynevere, the giant lady and got the vessel warp ring. At the bonfires there's no warp listed for Dark Moon Tomb, everyone seems to tell me there's supposed to be. How do I get there? What was the point of killing her?

Also, where is the firekeeper in that was at the Anor Lando bonfire? How do I get that person back?

There is no need to kill Gwynevere to advance with the main story. There are really only 2 reasons to kill her.
1. The two sentinels guarding S & O's chamber are replaced with two different guards that can be farmed for souls.

The fire keeper in Anor Lando is connected somehow to these two covenants. At this point in your play through he has changed locations and will be hostile the next time you see him. (not sure if absolving sins solves this)

Oh I see, it allows me to get into Dark Moon tomb without the ring. Finally found the entrance. Still needed to find it physically through searching. I hear Gwynevere is actually an illusion, anyone know when/where this is stated in game?

So I killed Gwynevere, the giant lady and got the vessel warp ring. At the bonfires there's no warp listed for Dark Moon Tomb, everyone seems to tell me there's supposed to be. How do I get there? What was the point of killing her?

Also, where is the firekeeper in that was at the Anor Lando bonfire? How do I get that person back?

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Why are you killing NPC's? Here's what you do, delete that game and start a new one. This time, don't kill every person who you need to help you through the game.

None of the npcs are critical to beating the game. You can slay them as you meet them and still finish the game. Depending on who you kill (andre for example oO), it might make the game a lot more painfull.